bruising after b12 injection : r/DiagnoseMe Managing Vaccine Injection Site Reactions:

Poor absorption owing to a deficiency of Intrinsic Factor (IF) is generally the underlying reason for PA and usually this is caused by an autoimmune action, in which antibodies (manufactured by the bodys immune system) mistakenly attack and destroy IF

Expected outcome: possible nausea, headache, injection-site reaction

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Its true that vitamin C has an important function in the body, but its controversial whether taking additional vitamin C orally or by injection offers any advantage for people who consume adequate vitamin C in their diet